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    <title>Document</title>
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    <script>
        console.log("2.34严格模式");
        //非严格模式
        function test1(a){
            arguments[0] = 34;
            console.log(a);
        }
        //严格模式
        function test2(a){
            "use strict";
            arguments[0]=34;
            console.log(a);
        }

        // function test3(a ,b=10){
        //     'use strict';//会报错
        // };


        test1(20);
        test2(20);
        test3(5);

    </script>
    
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